536 



HUMAN BIOLOGY 



France (Fig. 6), and the world as a whole (Fig. 7). In these 

 diagrams the circles give the census counts (or, in the case 

 of the world as a whole, estimates) of the populations 



5:: 



w 



30 



^ 20 



I 



/o 



IQOO 25 50 75 1900 



Year 



Fig. 6. Observed and calculated growth of population of France. 



existing at the given dates, while the smooth curves are the 

 fitted theoretical curves of population growth. 



In the case of the demographic units listed above the 

 census records do not extend over a sufficiently long time 



